New energy automobile battery pack special-effect fire extinguishing agent rapid access system and use method

Abstract

The invention provides a new energy automobile battery pack special effect fire extinguishing agent rapid access system and a use method, the system comprises a fire extinguishing equipment end, a frame body and a battery pack body installed in the frame body, and the system further comprises an external interface assembly used for rapidly connecting the fire extinguishing equipment end and the frame body; a fire extinguishing agent in the fire extinguishing equipment end is conveyed into a vehicle body pre-buried pipeline, and an external connector located on one side of the vehicle frame body has a one-way automatic sealing function; the vehicle body pre-buried pipeline is used for conveying a fire extinguishing agent input by the external interface into the battery pack body and is matched with the internal distribution device fixedly mounted in the battery pack to atomize and spray the fire extinguishing agent; according to the invention, the vehicle body embedded pipeline is matched with the external interface assembly and the internal distribution device in the battery pack, so that the fire extinguishing agent can directly reach the core area of the battery within 30 seconds, the response time is shortened by more than 80% compared with the traditional forcible entry fire extinguishing mode, the time for reducing the temperature of the battery pack from 800 DEG C to below 100 DEG C is less than or equal to 60 seconds through experimental verification, and the fire extinguishing efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to a fire extinguishing agent quick access system, in particular to a new energy vehicle battery pack special-effect fire extinguishing agent quick access system, belonging to the technical field of new energy vehicle safety. Background Art

[0002] With the popularity of new energy vehicles, fire accidents caused by thermal runaway of battery packs have become a major safety hazard in the industry. Existing fire extinguishing technologies often have the following problems: 1. Low external fire extinguishing efficiency: Traditional fire extinguishers or fire hoses have difficulty penetrating the sealed battery pack casing, and the fire extinguisher cannot directly reach the core area of ​​the battery cell, resulting in "surface fire extinguishing and internal re-ignition"; 2. Missing or inconsistent interfaces: Some vehicles lack dedicated fire extinguishing interfaces, requiring the vehicle body to be dismantled for rescue (taking 5-10 minutes), delaying the optimal fire extinguishing time. 3. Poor agent compatibility: Different fire extinguishing agents (such as perfluorohexanone and water-based fire extinguishing agents) have significantly different physical properties, and existing temporary access devices are unable to adapt to multiple types of agents. 4. High safety risk: Dismantling the vehicle body will expose high-voltage lines, increasing the risk of electric shock for rescue workers, and the dismantling process can easily cause a secondary explosion of the battery pack.

[0003] Therefore, an integrated and standardized rapid access system is urgently needed to solve the problems of "difficult access, difficult adaptation, and difficult rapid response" in new energy vehicle battery pack fires. To this end, a rapid access system and usage method for special fire extinguishing agents for new energy vehicle battery packs are proposed. Summary of the Invention

[0004] In view of this, the present invention provides a new energy vehicle battery pack special effect fire extinguishing agent quick access system and use method to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial choice.

[0005] The technical solution of the embodiment of the present invention is achieved as follows: a new energy vehicle battery pack special fire extinguishing agent rapid access system includes a fire extinguishing device end, a vehicle frame, and a battery pack installed in the vehicle frame. The system also includes an external interface component for quickly connecting the fire extinguishing device end and the vehicle frame to transport the fire extinguishing agent in the fire extinguishing device end to the pre-buried pipeline in the vehicle body. The external interface located on one side of the vehicle frame has a one-way automatic sealing function. The pre-buried pipeline in the vehicle body is used to transport the fire extinguishing agent input from the external interface into the battery pack. It cooperates with the internal distribution device installed and fixed in the battery pack to spray the fire extinguishing agent in an atomized manner. The external interface component and the internal distribution device work together to quickly transport the fire extinguishing agent from the fire extinguishing equipment end to the battery pack. The identification mechanism is used to identify the external interface on the vehicle frame; Among them, the external interface component is installed between the fire extinguishing equipment end and the frame body, the pre-buried pipeline of the vehicle body is connected between the external interface component and the internal distribution device, and the identification mechanism is installed on the outside of the frame body and is arranged corresponding to the external interface located on one side of the frame body.

[0006] Further preferably, the external interface assembly includes a snap-on quick-connect female connector and a snap-on quick-connect male connector; Among them, the snap-on quick-connect female head is installed on one side of the fire extinguishing equipment end, the snap-on quick-connect female head is provided with a manual locking ring, the snap-on quick-connect male head is installed on one side of the frame body, and a one-way valve is provided in the snap-on quick-connect male head. The closing pressure of the one-way valve is ≤0.1MPa. The snap-on quick-connect male head is inserted into the snap-on quick-connect female head and rotated 90° to complete the locking. The insertion and extraction force is ≤50N.

[0007] Further preferably, the material of the snap-on quick-connect male connector is aviation-grade aluminum alloy, the surface is anodized, and the temperature resistance is -40°C-150°C. The interface sealing ring is made of fluororubber and meets the IP6K9K waterproof and dustproof grade. Wherein, the snap-on quick-connect male connector is the main interface or the main interface and the auxiliary interface; The main interface is installed on the inner side of the left or right rear wheel arch of the vehicle frame, at a height of 600-800mm from the ground and a horizontal distance of 1000±50mm from the center axis of the rear wheel. Among them, the installation position of the auxiliary interface is the edge of the front cabin below the head of the frame body, with a horizontal distance of 800±50mm from the center axis of the front wheel.

[0008] Further preferably, a battery management system control module housing is installed on one side of the inner wall of the battery package, battery modules are evenly installed on the other side of the inner wall of the battery package, and a main cooling liquid channel is also provided in the battery package.

[0009] Further preferably, the vehicle body pre-buried pipeline includes a main pipeline and a branch pipeline; Among them, one end of the main pipeline is connected to one end of the snap-on quick-connect male connector, and the other end of the main pipeline is connected to one end of the branch pipeline. The main pipeline is installed on the inner side of the longitudinal beam of the frame body through an insulating snap, and the branch pipeline is installed inside the battery pack. The branch pipeline has 3-4 branches, and the diameter of each branch is 8-10mm, which respectively point to the gap between the battery module, the main channel of the battery pack coolant and the housing of the battery management system control module.

[0010] Further preferably, the main pipeline adopts a modified nylon tube of PA66+20% glass fiber with an inner diameter of 15-20mm, an outer diameter of 25-30mm, a pressure resistance of ≥1.5MPa, and tolerance to continuous high temperature of 150°C. The installation position of the main pipeline and the insulating clip is ≥50mm away from the vehicle-mounted high-voltage wiring harness.

[0011] Further preferably, the internal distribution device includes a fan-shaped nozzle and a high-temperature resistant clamp for fixing the nozzle to the inner wall of the battery package; The nozzle is connected to the end of each branch of the branch pipeline, has a spray angle of 60°, an aperture of 0.5-1mm, an atomization coverage radius of ≥150mm, and is made of polytetrafluoroethylene. The high-temperature resistant clamp can withstand short-time baking at 800°C, and its installation position is 50-100mm away from the surface of the battery cell.

[0012] Further preferably, the identification mechanism includes an interface cover with a prominent display color and flame retardant properties and a 3M reflective strip; The interface cover is mounted on the vehicle frame and is arranged corresponding to the snap-on quick-connect male connector, and the 3M reflective strip is pasted on the surface of the interface cover.

[0013] Further preferably, the sizes of the snap-on quick-connect female head and the snap-on quick-connect male head are compatible with the GB 19572 "Stainless steel compression fittings for low-pressure fluid transportation" standard, and support universal connector connections for firefighting robots and handheld spray gun equipment.

[0014] A method for using a new energy vehicle battery pack special-effect fire extinguishing agent rapid access system includes the following steps: S1. When the battery pack experiences thermal runaway, rescuers identify the location of the snap-on quick-connect male connector based on the color coding and open the connector cover. S2. Connect the female snap-on quick-connect connector on the fire extinguishing equipment to the male snap-on quick-connect connector and rotate 90° to lock. S3: The fire extinguishing equipment is activated. The fire extinguishing agent flows directly into the battery pack through the pre-buried pipeline in the vehicle body and is atomized and sprayed out through the internal distribution device to evenly cover the fire area. S4. After the fire is extinguished, rotate the female quick-connect connector in the opposite direction to disengage it, and the one-way valve in the male quick-connect connector will automatically close.

[0015] The embodiment of the present invention adopts the above technical solution, which has the following advantages: 1. This invention utilizes pre-buried pipes in the vehicle body, external interface components, and internal distribution devices within the battery pack to ensure that the fire extinguishing agent reaches the core battery area within 30 seconds. This shortens the response time by over 80% compared to traditional demolition firefighting methods. Experimental verification shows that the battery pack temperature can be reduced from 800°C to below 100°C in 60 seconds or less, effectively improving firefighting efficiency.

[0016] 2. The interfaces and pipelines in the system of the present invention are all insulated and high-temperature resistant, avoiding the risk of high-voltage electric shock during fire extinguishing; and the interfaces adopt a one-way automatic sealing design to prevent smoke leakage in the battery pack, reducing the exposure hazards of rescue personnel and increasing the safety of rescue personnel.

[0017] 3. The present invention supports mainstream agents such as perfluorohexanone, water-based fire extinguishing agents, and inert gases, and the standardized interface design can be adapted to different brands of fire extinguishing equipment and has wide compatibility.

[0018] 4. The pipes used in the system of the present invention weigh ≤2kg and occupy ≤1% of the battery pack space. They have been verified by vibration and high and low temperature cycle tests and do not affect the normal operation of the battery pack.

[0019] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 Schematic diagram of the system structure of the present invention; Figure 2 The present invention is a flowchart of the steps of the method for using the system.

[0022] Figure numerals: 1. Snap-on quick-connect female connector; 2. Snap-on quick-connect male connector; 3. One-way valve; 4. Manual locking ring; 5. Main pipeline; 6. Insulating clip; 7. Branch pipeline; 8. Battery management system control module housing; 9. Fire extinguishing equipment end; 10. Vehicle frame; 11. Battery pack; 12. Battery module; 13. Nozzle. DETAILED DESCRIPTION

[0023] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0024] It should be noted that the terms "first," "second," "symmetrical," and "array" are used solely for descriptive and positional purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Therefore, limitations on features such as "first" and "symmetrical" may explicitly or implicitly include one or more of these features. Similarly, when features are not limited in quantity using words such as "two" or "three," it should be noted that these features also explicitly or implicitly include one or more of these features.

[0025] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] like Figure 1-Figure 2 As shown, an embodiment of the present invention provides a new energy vehicle battery pack special fire extinguishing agent rapid access system, including a fire extinguishing device end 9, a vehicle frame 10, and a battery pack 11 installed in the vehicle frame 10. The system also includes an external interface component for quickly connecting the fire extinguishing device end 9 and the vehicle frame 10 to transport the fire extinguishing agent in the fire extinguishing device end 9 to the pre-buried pipeline in the vehicle body, and the external interface located on one side of the vehicle frame 10 has a one-way automatic sealing function; The pre-buried pipeline in the vehicle body is used to transport the fire extinguishing agent input from the external interface to the battery pack 11, and cooperates with the internal distribution device installed and fixed in the battery pack to atomize and spray the fire extinguishing agent. The external interface component and the internal distribution device cooperate to quickly transport the fire extinguishing agent from the fire extinguishing equipment end 9 to the battery pack 11; The identification mechanism is used to identify the external interface on the frame body 10; Among them, the external interface component is installed between the fire extinguishing equipment end 9 and the frame body 10, the pre-buried pipeline of the vehicle body is connected between the external interface component and the internal distribution device, and the identification mechanism is installed on the outside of the frame body 10 and is arranged corresponding to the external interface located on one side of the frame body 10.

[0027] In one embodiment, the external interface assembly includes a snap-on quick-connect female connector 1 and a snap-on quick-connect male connector 2; The female snap-on connector 1 is mounted on one side of the fire extinguishing equipment end 9, and a manual locking ring 4 is provided on the female snap-on connector 1. The male snap-on connector 2 is mounted on one side of the vehicle frame 10, and a one-way valve 3 is provided inside the male snap-on connector 2. The closing pressure of the one-way valve 3 is ≤0.1 MPa. The male snap-on connector 2 is inserted into the female snap-on connector 1 and rotated 90° to complete the locking. The insertion and extraction force is ≤50N. The snap-on quick-connect male connector 2 is made of aviation-grade aluminum alloy with an anodized surface, and can withstand temperatures of -40°C to 150°C. The interface sealing ring is made of fluororubber and meets IP6K9K waterproof and dustproof ratings. Among them, the snap-on quick-connect male connector 2 is the main interface or the main interface and the auxiliary interface; The main interface is installed on the inner side of the left or right rear wheel arch of the vehicle frame 10, at a height of 600-800 mm from the ground and a horizontal distance of 1000 ± 50 mm from the center axis of the rear wheel. The auxiliary interface is installed at the edge of the front compartment below the head of the frame body 10, at a horizontal distance of 800±50mm from the center axis of the front wheel; The snap-on quick-connect male connector 2 uses only one main interface, which can meet the fire extinguishing needs of small new energy cars or vehicles equipped with small battery packs, while the combination of main interface and auxiliary interface is for vehicles with long battery packs.

[0028] In one embodiment, a battery management system (BMS) control module housing 8 is mounted on one side of the inner wall of the battery package 11, and battery modules 12 are evenly mounted on the other side of the inner wall of the battery package 11. A main cooling liquid channel is also provided in the battery package 11. The pre-buried pipelines on the vehicle body include a main pipeline 5 and a branch pipeline 7; One end of the main pipeline 5 is connected to one end of the snap-on quick-connect male connector 2, and the other end of the main pipeline 5 is connected to one end of the branch pipeline 7. The main pipeline 5 is installed on the inner side of the longitudinal beam of the vehicle frame 10 via an insulating snap 6. The branch pipeline 7 is installed inside the battery pack 11. The branch pipeline 7 has 3-4 branches, each with a diameter of 8-10 mm, which are respectively directed to the gap between the battery module 12, the main channel of the battery pack coolant, and the battery management system (BMS) control module housing 8; The main pipeline 5 uses a modified nylon tube of PA66+20% glass fiber, with an inner diameter of 15-20mm, an outer diameter of 25-30mm, a pressure resistance of ≥1.5MPa, and can withstand a continuous high temperature of 150°C. The installation position of the main pipeline 5 and the insulating clip 6 is ≥50mm away from the vehicle-mounted high-voltage wiring harness.

[0029] Every two groups of battery cells in the battery module 12 correspond to a branch port of the branch pipe 7 , and the branch port of the branch pipe 7 is arranged in the opposite direction to the flow direction of the coolant in the main coolant channel of the battery pack.

[0030] In one embodiment, the internal distribution device includes a fan-shaped nozzle 13 and a high-temperature resistant clamp for fixing the nozzle 13 to the inner wall of the battery package 11; The nozzle 13 is connected to the end of each branch of the branch pipe 7, with a spray angle of 60°, an aperture of 0.5-1mm, an atomization coverage radius of ≥150mm, and is made of polytetrafluoroethylene. Among them, the high-temperature resistant clamp can withstand short-term baking at 800℃, and its installation position is 50-100mm away from the surface of the battery cell.

[0031] By controlling the installation position of the nozzle 13 and the high-temperature resistant clamp, the battery is prevented from short-circuiting during use. The nozzle 13 is made of polytetrafluoroethylene, which is resistant to chemical corrosion and does not affect the insulation of the battery.

[0032] In one embodiment, the identification mechanism includes an interface cover with a prominent display color and flame retardant properties and 3M reflective tape; The interface cover is mounted on the frame 10 and is corresponding to the snap-on quick-connect male connector 2 , and a 3M reflective strip is attached to the surface of the interface cover.

[0033] The outer cover of the interface is made of red high-gloss flame-retardant ABS material. The surface can also be printed with the Chinese and English words "Battery Fire Extinguishing Interface" and arrow instructions to cooperate with 3M reflective strips to help rescuers quickly locate the position of the snap-on quick-connect male connector 2.

[0034] In one embodiment, the sizes of the snap-on quick-connect female connector 1 and the snap-on quick-connect male connector 2 are compatible with the GB 19572 "Stainless steel compression fittings for low-pressure fluid transportation" standard, and support universal connector connections for firefighting robots and handheld spray gun equipment.

[0035] By standardizing the adaptation design of external interface components, it can be adapted to different brands of fire-fighting equipment, which helps promote industry standardization.

[0036] A method for using a new energy vehicle battery pack special-effect fire extinguishing agent rapid access system includes the following steps: S1. When thermal runaway occurs in the battery pack, rescue personnel determine the position of the snap-on quick-connect male connector 2 according to the color code and open the interface cover. S2. Connect the female snap-on connector 1 of the fire extinguishing equipment end 9 to the male snap-on connector 2 and rotate 90° to lock. S3. Start the fire extinguishing device terminal 9. The fire extinguishing agent flows directly into the battery pack 11 through the pre-buried pipeline of the vehicle body. The fire extinguishing agent is atomized and sprayed out through the internal distribution device to evenly cover the fire area. S4. After the fire is extinguished, the female snap-on quick-connect connector 1 can be disengaged by rotating it in the opposite direction, and the one-way valve 3 in the male snap-on quick-connect connector 2 is automatically closed.

[0037] When the present invention is working: take a pure electric car with a wheelbase of 3000mm as an example; The relevant parameters in the system are: Battery pack dimensions: 2200mm long x 1400mm wide x 150mm high (80kWh capacity, divided into front and rear modules); The snap-on quick-connect male connector 2 in the external interface assembly uses a combination of a main interface and an auxiliary interface. The main interface is located inside the left rear wheel arch of the vehicle body, and the auxiliary interface is located under the front of the vehicle. The inner diameter of the main pipeline 5 in the pre-buried pipeline of the vehicle body is 18mm, and the inner diameter of the branch pipeline 7 is 9mm; The number of nozzles 13 in the internal distribution device is 4 (2 in the front section and 2 in the rear section); Suitable agent: perfluorohexanone (injection pressure 0.8MPa, dosage 1.6L).

[0038] Installation details: The center of the main interface is 1000mm horizontally from the center of the left rear wheel and 700mm from the ground. The interface cover is flush with the frame body 10 and has a pull ring on the edge (it can be opened with a pulling force ≥ 50N); The main pipeline 5 extends from the main interface along the left longitudinal beam to the middle of the battery pack 11 and is fixed by three insulating clips 6 (with a spacing of 500mm); The branch pipes 7 in the battery pack 11 are respectively directed to: the gap between the front module cells of the battery module 12 (2 spray nozzles), the rear module coolant inlet (1), and the BMS module (1). The spray nozzles are angled downward at 30 degrees to prevent the chemicals from directly impacting the high-voltage terminals.

[0039] Test verification: In the simulated battery thermal runaway experiment (using needle puncture to trigger thermal runaway), after injecting perfluorohexanone through this system: The flame goes out within 30 seconds without re-ignition; The maximum temperature of the battery pack shell dropped from 780°C to 95°C; There is no leakage at the interface connection and no deformation of the pipeline, which meets the IP6K9K protection requirements.

[0040] The present invention solves the core pain points of fire rescue in new energy vehicle battery packs through structural design. It has the advantages of speed, safety and versatility, and can be promoted and applied as a standard safety configuration for new energy vehicles.

[0041] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A new energy vehicle battery pack special fire extinguishing agent rapid access system, comprising a fire extinguishing equipment end (9), a vehicle frame (10) and a battery pack (11) installed in the vehicle frame (10), characterized in that: The system further comprises an external interface component for quickly connecting the fire extinguishing device end (9) and the vehicle frame (10) to transport the fire extinguishing agent in the fire extinguishing device end (9) to the pre-buried pipeline of the vehicle body, and the external interface located on one side of the vehicle frame (10) has a one-way automatic sealing function; The pre-buried pipeline on the vehicle body is used to transport the fire extinguishing agent input from the external interface into the battery pack (11), and cooperate with the internal distribution device installed and fixed in the battery pack to spray the fire extinguishing agent in an atomized manner, and cooperate with the external interface component and the internal distribution device to quickly transport the fire extinguishing agent from the fire extinguishing equipment end (9) to the battery pack (11); The identification mechanism is used to identify the external interface on the vehicle frame (10); The external interface assembly is installed between the fire extinguishing equipment end (9) and the vehicle frame (10), the vehicle body pre-buried pipeline is connected between the external interface assembly and the internal distribution device, and the identification mechanism is installed on the outside of the vehicle frame (10) and is arranged corresponding to the external interface located on one side of the vehicle frame (10).

2. The new energy vehicle battery pack special fire extinguishing agent rapid access system according to claim 1 is characterized by: The external interface assembly comprises a snap-on quick-connect female connector (1) and a snap-on quick-connect male connector (2); The snap-on quick-connect female head (1) is installed on one side of the fire extinguishing equipment end (9), a manual locking ring (4) is provided on the snap-on quick-connect female head (1), the snap-on quick-connect male head (2) is installed on one side of the vehicle frame (10), a one-way valve (3) is provided in the snap-on quick-connect male head (2), the closing pressure of the one-way valve (3) is ≤0.1MPa, the snap-on quick-connect male head (2) is inserted into the snap-on quick-connect female head (1), and the locking is completed by rotating 90°, and the insertion and extraction force is ≤50N.

3. The new energy vehicle battery pack special fire extinguishing agent rapid access system according to claim 2 is characterized by: The material of the snap-on quick-connect male connector (2) is aviation-grade aluminum alloy, with an anodized surface, and a temperature resistance of -40°C to 150°C. The interface sealing ring is made of fluororubber and meets the IP6K9K waterproof and dustproof grade. Wherein, the snap-on quick-connect male connector (2) is a main interface or a main interface and an auxiliary interface; The main interface is installed at the inner side of the left or right rear wheel arch of the vehicle frame (10), at a height of 600-800 mm from the ground and at a horizontal distance of 1000±50 mm from the center axis of the rear wheel; The auxiliary interface is installed at the edge of the front compartment below the head of the vehicle frame (10), at a horizontal distance of 800±50mm from the center axis of the front wheel.

4. The new energy vehicle battery pack special fire extinguishing agent rapid access system according to claim 2 is characterized by: A battery management system control module housing (8) is installed on one side of the inner wall of the battery package (11), and battery modules (12) are evenly installed on the other side of the inner wall of the battery package (11). A main cooling liquid channel is also provided in the battery package (11).

5. The new energy vehicle battery pack special fire extinguishing agent rapid access system according to claim 4 is characterized by: The vehicle body pre-buried pipeline includes a main pipeline (5) and a branch pipeline (7); One end of the main pipeline (5) is connected to one end of a snap-on quick-connect male connector (2), and the other end of the main pipeline (5) is connected to one end of a branch pipeline (7). The main pipeline (5) is installed on the inner side of the longitudinal beam of the vehicle frame (10) through an insulating snap (6), and the branch pipeline (7) is installed inside the battery pack (11). The branch pipeline (7) has 3-4 branches, and the diameter of each branch is 8-10 mm, which respectively point to the gap of the battery module (12), the main channel of the battery pack coolant, and the battery management system control module housing (8).

6. The new energy vehicle battery pack special fire extinguishing agent rapid access system according to claim 5 is characterized by: The main pipeline (5) is made of a modified nylon tube of PA66+20% glass fiber, with an inner diameter of 15-20 mm, an outer diameter of 25-30 mm, a pressure resistance of ≥1.5 MPa, and a resistance to a continuous high temperature of 150°C. The installation position of the main pipeline (5) and the insulating clip (6) is ≥50 mm away from the vehicle-mounted high-voltage wiring harness.

7. The new energy vehicle battery pack special fire extinguishing agent rapid access system according to claim 5 is characterized by: The internal distribution device includes a fan-shaped nozzle (13) and a high-temperature resistant clamp for fixing the nozzle (13) to the inner wall of the battery package (11); The nozzle (13) is connected to the end of each branch of the branch pipeline (7), has a spray angle of 60°, an aperture of 0.5-1 mm, an atomization coverage radius of ≥150 mm, and is made of polytetrafluoroethylene. The high-temperature resistant clamp can withstand short-time baking at 800°C, and its installation position is 50-100mm away from the surface of the battery cell.

8. The new energy vehicle battery pack special fire extinguishing agent rapid access system according to claim 2 is characterized by: The identification mechanism includes an interface cover with a prominent display color and flame retardant properties and a 3M reflective strip; The interface outer cover is mounted on the vehicle frame (10) and is arranged corresponding to the snap-on quick-connect male connector (2), and the 3M reflective strip is adhered to the surface of the interface outer cover.

9. The new energy vehicle battery pack special fire extinguishing agent rapid access system according to claim 2 is characterized by: The sizes of the snap-on quick-connect female head (1) and the snap-on quick-connect male head (2) are compatible with the standard GB 19572 “Stainless steel compression fittings for low-pressure fluid delivery” and support universal connector connections for firefighting robots and handheld spray gun equipment.

10. The method for using the new energy vehicle battery pack special fire extinguishing agent rapid access system according to any one of claims 2 to 9, characterized in that: The following steps are involved: S1. When the battery pack experiences thermal runaway, the rescuer determines the position of the snap-on quick-connect male connector (2) according to the color marking and opens the interface cover; S2. Connect the snap-on quick-connect female connector (1) of the fire extinguishing equipment end (9) to the snap-on quick-connect male connector (2), and rotate 90° to complete the locking; S3, start the fire extinguishing equipment end (9), the fire extinguishing agent directly reaches the battery pack (11) through the pre-buried pipeline of the vehicle body, and the fire extinguishing agent is atomized and sprayed out through the internal distribution device to evenly cover the fire area; S4. After the fire is extinguished, the female snap-on quick-connector (1) can be disengaged by rotating it in the opposite direction, and the one-way valve (3) in the male snap-on quick-connector (2) is automatically closed.

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